Create another Podcaster; then a new Subject class for YouTubers; experiment with UML Generator in your IDE
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Fork and clone the repository
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Create another Podcaster object and register several of the existing Follower / Fans
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Create a new Observer called SuperFan and register with the Podcaster
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Create a new Subject called YouTuber that implements the Subject interface; register a couple of existing Follower/Fan/Superfan object with the YouTuber
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Generate a UML Class Diagram using your IDE